Load Specifications
Load data in caliber .25 Creedmoor with .257 | 115gr | Nosler Ballistic Tip Hunting bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 56,028 psi | 90% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,940 psi | 89% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,127 psi | 86% | 2808 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,983 psi | 87% | 2789 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,887 psi | 68% | 2680 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 55,143 psi | 89% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,911 psi | 89% | 2923 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,347 psi | 89% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,069 psi | 86% | 2818 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,172 psi | 87% | 2818 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,085 psi | 89% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,810 psi | 88% | 2986 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,040 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,301 psi | 86% | 2858 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 2979 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,476 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,089 psi | 65% | 2713 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,889 psi | 72% | 2877 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,042 psi | 89% | 2884 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 53,359 psi | 86% | 2854 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,664 psi | 87% | 2825 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,028 psi | 90% | 2802 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,664 psi | 87% | 2848 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,782 psi | 90% | 2949 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,549 psi | 88% | 2871 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 53,998 psi | 87% | 2917 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 54,723 psi | 88% | 2881 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 55,898 psi | 90% | 2881 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,083 psi | 84% | 2851 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,187 psi | 89% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,433 psi | 88% | 2953 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 57% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,766 psi | 87% | 2831 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,840 psi | 90% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,883 psi | 90% | 2854 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,637 psi | 90% | 2831 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 54,070 psi | 87% | 2851 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,637 psi | 90% | 2861 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2913 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 54,665 psi | 88% | 2887 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,172 psi | 87% | 2818 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,071 psi | 89% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,868 psi | 88% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,840 psi | 90% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,853 psi | 88% | 2851 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 55,738 psi | 90% | 2884 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 54,157 psi | 87% | 2815 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,679 psi | 88% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 88% | 52,518 psi | 85% | 2844 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 54,607 psi | 88% | 2900 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 53,766 psi | 87% | 2907 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 53,026 psi | 86% | 2871 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 52,750 psi | 85% | 2907 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 54,607 psi | 88% | 2838 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,114 psi | 87% | 2854 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,839 psi | 88% | 2815 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 58% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,737 psi | 88% | 2851 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,867 psi | 87% | 2927 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,243 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,433 psi | 88% | 2943 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,230 psi | 87% | 2972 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,100 psi | 89% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,650 psi | 88% | 2812 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,200 psi | 86% | 2844 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,664 psi | 87% | 2825 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,853 psi | 88% | 2851 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,071 psi | 89% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,840 psi | 90% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,738 psi | 90% | 2884 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,158 psi | 89% | 2910 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,055 psi | 86% | 2815 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,693 psi | 87% | 2841 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,709 psi | 90% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,695 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,172 psi | 89% | 2802 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 55,216 psi | 89% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,013 psi | 89% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,591 psi | 85% | 2805 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 53,650 psi | 87% | 2844 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,764 psi | 83% | 2910 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,080 psi | 78% | 2789 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 55,158 psi | 89% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,956 psi | 90% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,433 psi | 88% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,955 psi | 89% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,100 psi | 89% | 2822 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 52,765 psi | 85% | 2851 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 54,679 psi | 88% | 2818 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,374 psi | 86% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,390 psi | 89% | 2910 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,092 psi | 71% | 2792 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,040 psi | 86% | 2831 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,665 psi | 88% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,998 psi | 87% | 2917 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,042 psi | 58% | 2720 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,548 psi | 86% | 2848 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,763 psi | 80% | 2674 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,322 psi | 68% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,647 psi | 80% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,427 psi | 76% | 2680 fps | 95.5% |
| Accurate 3100 | <<locked>> | 98% | 39,291 psi | 63% | 2631 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 40,016 psi | 65% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,765 psi | 54% | 2526 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,876 psi | 74% | 2713 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,044 psi | 63% | 2562 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,921 psi | 77% | 2717 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,196 psi | 78% | 2697 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,582 psi | 67% | 2740 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,638 psi | 62% | 2582 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,524 psi | 67% | 2648 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,113 psi | 55% | 2539 fps | 95.6% |
| Alliant Reloder-17 | 36.4 gr | 80% | 33,446 psi | 54% | 2552 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,559 psi | 48% | 2444 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,376 psi | 59% | 2684 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,005 psi | 73% | 2713 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 38,508 psi | 62% | 2589 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 44,367 psi | 72% | 2661 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,690 psi | 80% | 2707 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,717 psi | 75% | 2740 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,793 psi | 84% | 2887 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,044 psi | 63% | 2589 fps | 96.6% |
| Hodgdon H414 | 40 gr | 90% | 44,164 psi | 71% | 2746 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 48,037 psi | 77% | 2766 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,296 psi | 75% | 2723 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,356 psi | 47% | 2385 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,192 psi | 68% | 2694 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 90% | 44,208 psi | 71% | 2766 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 43% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,425 psi | 72% | 2674 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,977 psi | 74% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,002 psi | 66% | 2595 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,279 psi | 70% | 2615 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 44,788 psi | 72% | 2694 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,352 psi | 70% | 2641 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 32,866 psi | 53% | 2487 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 42,569 psi | 69% | 2677 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 47,921 psi | 77% | 2717 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,962 psi | 73% | 2687 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,556 psi | 73% | 2644 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 40,727 psi | 66% | 2595 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,956 psi | 61% | 2539 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 43,555 psi | 70% | 2674 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,773 psi | 72% | 2661 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,136 psi | 73% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,915 psi | 66% | 2635 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 50,981 psi | 82% | 2841 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,098 psi | 55% | 2526 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 40,321 psi | 65% | 2644 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 40,553 psi | 65% | 2677 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,819 psi | 77% | 2726 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,558 psi | 77% | 2746 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,488 psi | 83% | 2766 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 43% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,279 psi | 68% | 2631 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,787 psi | 71% | 2753 fps | 98.8% |
| ReloadSwiss RS 60 | 36.4 gr | 80% | 35,607 psi | 57% | 2618 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,042 psi | 58% | 2602 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,377 psi | 62% | 2661 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 48,704 psi | 79% | 2697 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,612 psi | 69% | 2612 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,100 psi | 58% | 2533 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 44,367 psi | 72% | 2661 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,956 psi | 61% | 2539 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,962 psi | 73% | 2687 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,727 psi | 66% | 2595 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,555 psi | 70% | 2674 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,985 psi | 60% | 2579 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,137 psi | 74% | 2700 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,237 psi | 71% | 2677 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,166 psi | 74% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,479 psi | 62% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,438 psi | 68% | 2589 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,808 psi | 84% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,687 psi | 74% | 2612 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,788 psi | 74% | 2694 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,825 psi | 59% | 2536 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 26,876 psi | 43% | 2369 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 44,918 psi | 72% | 2733 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,982 psi | 84% | 2667 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,499 psi | 75% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,279 psi | 68% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,786 psi | 69% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,070 psi | 57% | 2474 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 35,607 psi | 57% | 2530 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,153 psi | 78% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,133 psi | 66% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,099 psi | 57% | 2530 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 31,575 psi | 51% | 2513 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,067 psi | 50% | 2398 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 47,805 psi | 77% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,483 psi | 72% | 2749 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,646 psi | 48% | 2523 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,947 psi | 71% | 2687 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 97 powders for .25 Creedmoor loaded with the .257 | 115gr | Nosler Ballistic Tip Hunting. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,986 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.257" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-17, ReloadSwiss RS 60, Hodgdon H414 rank at the top here: for .25 Creedmoor with the .257 | 115gr | Nosler Ballistic Tip Hunting they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.